Analysis of multichannel seismic profiles collected on the continental rise off the Sabrina Coast, East Antarctica, has allowed the determination of the acoustic features that are indicative of major evolution steps of the East Antarctic Ice Sheet (EAIS) and highlights the role of meltwater that originated from Totten Glacier in shaping the margin architecture. The arrival of marine-terminating glaciers into the coastal region was recorded by an enhanced sediment input on the continental rise and the nucleation of channel-levees. Downslope sedimentary processes were dominant throughout the Late Cenozoic, testifying to the progressive growth of a highly dynamic, temperate ice sheet on the continent. The last evolutionary step marks the transition to when a full polar glacial regime occurred. The development of a prograding wedge with steeply dipping foresets on the continental shelf and slope exemplifies sedimentation at this time. Other sub-sea-floor observations indicate that downslope fluxes, triggered by glacial meltwater, were still able to deeply erode and deliver sediments to the rise area. This study's findings have led to the identification of expanded and well-preserved sedimentary successions, which we suggest should be considered as priority targets for future International Ocean Discovery Program deep drilling due to the sensitivity of the ice sheet in this area.

中文翻译：

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托腾冰川对晚新生代沉积记录的影响

对在东南极洲萨布丽娜海岸的大陆隆起上收集的多道地震剖面进行分析，可以确定表明东南极冰盖 (EAIS) 主要演化步骤的声学特征，并突出了融水的作用来自 Totten Glacier 塑造边缘架构。终止海洋的冰川到达沿海地区是通过大陆上升的沉积物输入增加和河道堤坝的成核记录的。下坡沉积过程在整个晚新生代占主导地位，证明了该大陆上高度动态的温带冰盖的逐步生长。最后一个进化步骤标志着向完全极地冰川状态发生的过渡。大陆架和斜坡上具有陡峭倾斜森林的前进楔的发展是此时沉积的例证。其他海底观测表明，由冰川融水引发的下坡通量仍然能够深度侵蚀并将沉积物输送到上升区域。这项研究的结果导致了扩展和保存完好的沉积序列的识别，由于该区域冰盖的敏感性，我们建议应将其视为未来国际海洋发现计划深钻的优先目标。